It’s been like 4 years so I really don’t remember much but they were in a singing competition kinda like the voice. The artists competing were mentees of established entertainment industry hotshots, the main relationship was between mentor and mentee. I think they knew each other in the past but only one of them remembers (not too sure about this one). And the MC won or came in second I know this isn’t much to go off of but I appreciate your help!
Diss Love?
https://www.mangago.me/read-manga/diss_love/
My fav show is back